Drive Controller SD4B with New High-current Variant

Although the rated current was increased from 10 A to 13 A in the high-current variant, the device still features the small construction volume and especially the small width of 25 mm. Both SD4B variants combine various function in their IP20 housings despite their compact dimensions. The drive controllers are, for example, equipped with the safety function Safe Torque Off (STO) as well as interfaces for CANopen and Modbus TCP as standard. A multiprotocol real-time Ethernet interface is offered as an option, making a flexible communication between the higher ranking control via EtherCAT (CoE), PROFINET IO and POWERLINK possible. Beside the TTL encoder input and output, five digital inputs/outputs each as well as an Ethernet interface for easy parameterization are available to the users

Thanks to high clock frequencies of up to 32 kHz, SD4B as frequency converter supports sensorless operation of synchronous motors up to 240,000 rpm and asynchronous motors up to 360,000 rpm in the high-speed range. In addition, sensor-based control with TTL encoders is available. The robust speed control can also cope with high mass inertia ratios of up to 1:100 between motor and tool

Load indicator included

Moreover, SD4B features an integrated load indicator. This function evaluates the torque-forming current of the motor and therefore can be used to replace acoustic emission sensors. Hence, load changes of the motor are determined very precisely. This in turn allows drawing conclusions on possible tool breakage or tool wear. In addition, the load indicator can be used to detect the contact between tool and work piece (gap elimination) as well as flexibly adjust feed rates.